Senator JOYCE (Queensland—Leader of The Nationals in the Senate) (21:17): How can you have an affirmation and a possibility in the one sentence—I may, cannot? What exactly do you mean? It is like everything else in this, like every other question I have asked you yesterday and tonight, where you do not have an answer. How can you have may and cannot? It is a non sequitur. It makes no sense. Like everything else in this act, like the idea of cooling the planet from a room in this building, it makes no sense. Nonetheless, let us go on to other things. What is the process of becoming a prescribed international unit?